| 摘要 |
The present invention relates to a method of forming an optical element that includes a mark. The method involves, irradiating at least a portion of a surface of the optical element with laser radiation, thereby forming a plurality of substantially parallel elongated grooves in the portion of the surface, which are each aligned substantially parallel with a common longitudinal direction that extends from a center point of the plurality of elongated grooves. The plurality of elongated grooves together define the mark. A clear film is formed over at least the portion of the surface and the plurality of elongated grooves. Depending on the orientation of a source of electromagnetic radiation as viewed through the optical element relative to the common longitudinal direction of the grooves, the mark is either observable or unobservable. The present invention also relates to an optical element having a mark, as described above. |
| 主权项 |
1. A method of producing an optical element having a mark comprising:
(a) irradiating at least a portion of a surface of said optical element with laser radiation, thereby forming a plurality of elongated grooves in said portion of said surface, wherein, each elongated groove has a longitudinal axis, each elongated groove is substantially parallel to an adjacent elongated groove, the longitudinal axis of each elongated groove is aligned substantially parallel with a common longitudinal direction that extends from a center point of said plurality of elongated grooves, and said plurality of elongated grooves together define said mark; and (b) forming a clear film over at least said portion of said surface and said plurality of elongated grooves, wherein, said mark is substantially unobservable when a source of electromagnetic energy is viewed through said optical element at a first position that has a first alignment with said center point that is substantially parallel to said common longitudinal direction, and said mark is substantially observable when said source of electromagnetic energy is viewed through said optical element at a second position that has a second alignment with said center point that is substantially orthogonal to said common longitudinal direction. |
